/**
 * Copyright (c) 2012-2013, Michael Yang 杨福海 (www.yangfuhai.com).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.aisen.android.component.bitmaploader.core;

import android.content.Context;
import android.graphics.Bitmap;
import android.os.Environment;
import android.os.StatFs;

import java.io.File;

public class BitmapCommonUtils {

	/**
	 * 获取可以使用的缓存目录
	 * 
	 * @param context
	 * @param uniqueName
	 *            目录名称
	 * @return
	 */
	public static File getDiskCacheDir(Context context, String uniqueName) {
		final String cachePath = Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState()) ? getExternalCacheDir(context).getPath()
				: context.getCacheDir().getPath();

		return new File(cachePath + File.separator + uniqueName);
	}

	/**
	 * 获取bitmap的字节大小
	 * 
	 * @param bitmap
	 * @return
	 */
	public static int getBitmapSize(Bitmap bitmap) {
		return bitmap.getRowBytes() * bitmap.getHeight();
	}

	/**
	 * 获取程序外部的缓存目录
	 * 
	 * @param context
	 * @return
	 */
	public static File getExternalCacheDir(Context context) {
		final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
		return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
	}

	/**
	 * 获取文件路径空间大小
	 * 
	 * @param path
	 * @return
	 */
	public static long getUsableSpace(File path) {
		final StatFs stats = new StatFs(path.getPath());
		return (long) stats.getBlockSize() * (long) stats.getAvailableBlocks();
	}
	
}
